Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5427888 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2015 | 6 Pages |
â¢Description of new discharge with peak electron densities higher than 7Ã1023 mâ3.â¢New method for spectral line shift measurements presented.â¢Stark shifts for He I 706.522 nm for several electron densities measured.â¢Stark shifts for He I 706.522 nm compared with theoretical and experimental results.â¢Derived formula for Stark shifts of the He I 706.522 nm line dependence upon electron density.
We present results of Stark shift measurements for He I 706.522Â nm (1s2p 3P20-1s3s 3S1 and 1s2p 3P10-1s3s 3S1) lines using newly constructed pulsed arc generated at the pressure of two hundreds of milibars of helium with small admixture of hydrogen. Plasma electron number density in the range (0.5-7.0)Ã1023Â mâ3 was measured from the wavelength separation between the allowed He I 447.1Â nm (2p 3P0-4d 3D) line and its forbidden component (2p 3P0-4d 3F0), while the electron temperature in the range (15,000-20,000)Â K was determined from the relative intensities of Si II lines using the Boltzmann plot technique. New Stark shift measurement technique was demonstrated using line shape recording of several He I lines. The shift results for He I 706.522Â nm line so favorably compare with earlier lower density experimental data that best fit formula is recommended for plasma diagnostic purposes.